sktime/sktime

[ENH] Migrate tags in tags registry from tuples to classes

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#10,804 opened on Aug 10, 2026

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 (3 comments) (0 reactions) (0 assignees)Python (1,192 forks)batch import
enhancementgood first issuemodule:base-framework

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Description

Tags in sktime are defined as classes located in sktime/registry/_tags.py. However, previously they were defined as tuples present in ESTIMATOR_TAG_REGISTER. Most of those tag tuples were migrated to separate classes, but some of them are still just tuples. We should migrate them to separate classes too.

Please pick one tag at a time, and post which you are picking.

Contributor guide

Research direction
Inspect the existing tags in ESTIMATOR TAG REGISTER and the class based tag definitions in tags.py to understand the migration pattern. Then pick one tuple tag and convert it to a class following the existing class based structure.
Tech stack
python
Domain
backend
Issue type
Refactor
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
GitPython
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
75